DATA:      Snoeijs et Prentice (1989)
DIRECTORY: \CANOCO\SAMPLES\UNIMODAL\EPIALGAE
PROBLEM:   Effect of cooling-water discharge from a power plant on epilithic 
           algal communities
BOOKLET:   pp 140-141 and 148-149
ILLUSTRATION OF:
+ the display of environmental variables by way of their canonical coefficients
+ the difference between environmental biplot scores (BipE:) and canonical
  coefficients (Regr:)
_______________________________________________________________________________
FILE TYPE    |  FILE NAME    |         DESCRIPTION
-------------+---------------+-------------------------------------------------
 SPECIES     | epialgae.dta  | 88 epilithic algae in 181 samples from 11 sites
ENVIRONMENT  | sitetime.dta  | indicators of site and month of sampling
             | basinenv.dta  | 20 environmental variables at the 181 samples
 PROJECTS    | epi_cca.con   | CCA with model "site+month" and the 20 
             |               |  environmental variables as Supplementary 
             |               |  variables
             | anomaly.con   | idem, but with only the mean temperature anomaly 
             |               |  and flow as Supplementary variables
-------------+---------------+-------------------------------------------------

The data and analysis are taken from Snoeijs & Prentice (1989). One
aspect is shortly discussed in Ter Braak (1994: pp 128-129 and pp
136-137).

References:
Snoeijs, P.J.M. & Prentice, I.C.(1989):
Effects of cooling water discharge on the structure and dynamics of 
epilithic algal communities in the northern Baltic. 
Hydrobiologia, 184: 99-123.

Ter Braak, C.J.F.(1994):
Canonical community ordination. Part I: Basic theory and linear methods
Ecoscience, 1: 127-140.